79977977 has 2 divisors, whose sum is σ = 79977978. Its totient is φ = 79977976.

The previous prime is 79977971. The next prime is 79977983. The reversal of 79977977 is 77977997.

It is a balanced prime because it is at equal distance from previous prime (79977971) and next prime (79977983).

It can be written as a sum of positive squares in only one way, i.e., 74978281 + 4999696 = 8659^2 + 2236^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79977977 is a prime.

It is not a weakly prime, because it can be changed into another prime (79977971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39988988 + 39988989.

It is an arithmetic number, because the mean of its divisors is an integer number (39988989).

Almost surely, 2^79977977 is an apocalyptic number.

It is an amenable number.

79977977 is a deficient number, since it is larger than the sum of its proper divisors (1).

79977977 is an equidigital number, since it uses as much as digits as its factorization.

79977977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12252303, while the sum is 62.

The square root of 79977977 is about 8943.0407021326. The cubic root of 79977977 is about 430.8473951150.

The spelling of 79977977 in words is "seventy-nine million, nine hundred seventy-seven thousand, nine hundred seventy-seven".